Updated the camerabin2 based camera with QtMultimedia changes

Moved it to the separate plugin as the rest of gstreamer based services;
Updated with libqgsttools_p changes;
Implemented QMediaRecorder::status property;
Made gst_photography dependency optional,
it's not always available on desktop;
Added video recording case to auto integration test;
Moved backend implementation into qt namespace

Task-number: QTBUG-26046
Change-Id: Iacfc1a6e263a4c0201d5eb28d04c960b87a230c0
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/plugins/gstreamer/camerabin/camerabincapturebufferformat.cpp

@@ -42,6 +42,8 @@
 #include "camerabincapturebufferformat.h"
 #include "camerabinsession.h"
 
+QT_BEGIN_NAMESPACE
+
 CameraBinCaptureBufferFormat::CameraBinCaptureBufferFormat(CameraBinSession *session)
     :QCameraCaptureBufferFormatControl(session)
      , m_session(session)
@@ -76,3 +78,5 @@ void CameraBinCaptureBufferFormat::setBufferFormat(QVideoFrame::PixelFormat form
         emit bufferFormatChanged(format);
     }
 }
+
+QT_END_NAMESPACE